
After the introduction of CT into clinical practice in 1972, the soft tissue extension from paranasal sinuses lesions could be visualized. The anatomical relationship of paranasal sinuses with surrounding structures could be directly appreciated. CT has capability of showing soft tissue detail relative to the osseous walls and air spaces of the paranasal sinuses. Such information is indispensible for determination of operability and planning of radiotherapy as well as for assessment after therapy. The latest generation of scanners such as MDCT, which have high resolution, thin sectioning and specific techniques for bone evaluation have established MDCT as overall best method for evaluation of patients who are suspected of having an aggressive lesion of the paranasal sinuses.